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林业科学 ›› 2005, Vol. 41 ›› Issue (1): 1-4.doi: 10.11707/j.1001-7488.20050101

• 论文及研究报告 •    下一篇

果树冠层太阳总辐射与净辐射分形特征的相关分析

孟平1,2 张劲松1 高峻1   

  1. 1.中国林业科学研究院林业研究所国家林业局林木培育重点实验室,北京100091;2.中南林学院 长沙410004
  • 收稿日期:2003-10-21 修回日期:1900-01-01 出版日期:2005-01-25 发布日期:2005-01-25

Fractal Characteristics Correlation between the Solar Total Radiation and Net Radiation on the Apple Tree Canopy

Meng Ping1,2,Zhang Jinsong1,Gao Jun1   

  1. 1.Research Institute of Forestry CAF Key Laboratory of Forest Silviculture of the State Forestry Administration Beijing100091; 2.Central South Forestry University Changsha410004
  • Received:2003-10-21 Revised:1900-01-01 Online:2005-01-25 Published:2005-01-25

摘要:

根据太行山低山丘陵区苹果树主要生长季节冠层太阳总辐射(Q)与净辐射(Rn)的实测资料,在回归分析的基础上,从分形理论的角度,进一步揭示QRn 的关系特征,探索果树冠层净辐射的计算方法。结果表明:1)RnQ具有很好的线性相关关系,回归拟合关系式为Rn =0.7408Q - 32.436 ,相关系数r可达0.9811(n =26279) ,Fcal=343 665.2 >>F0.01 2677=6.63;2 )QRn分形曲线均存在2个无标度区,二者无标度区拐点的界限时间分别为453、441min ,且分形维数均很接近,第1标度区分别为1.1126、1.1319,第2标度区分别为1.9136、1.8834,说明QRn 的分形特征非常相似。因此,可以利用苹果树冠层太阳总辐射推算净辐射。

关键词: 苹果树, 太阳总辐射, 净辐射, 回归分析, 分形特征

Abstract:

The characteristics correlation between solar total radiations(Q) and net radiation(Rn) on the apple tree canopy at mainly growth stage in the hilly of Taihang Mountain are analyzed with fractal theory based on regression analysis. The results showed that:1)Q and Rn had good liner correlation. The regression function was as the following:Rn=0.7408Q-32.436, which coefficient r is 0.981 1(n=26 279), Fcal=343 665.2 >>F0.01 2677=6.63;2)The fractal dimension curves of Q and Rn both had two no-scaling regions, which circumscription time value of the inflexion was 453 and 441 minutes respectively.In the first region, fractal dimensions of Q and Rn was 1.112 6, 1.131 9 respectively,and 1.913 6、 1.883 4 in the second region.Those information showed that fractal characteristics of Q and Rn is similar. So Rn can be calculated with Q on the apple tree canopy.

Key words: apple tree, solar total radiation, net radiation, regression analysis, fractal characteristics